<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  
</body>
<script>
  // 2. 使用set实现数组去重
  const arr = [1,2,3,3,4,4,5,6,7,2,3];
  
  // let set = new Set();
  // for(let i = 0; i < arr.length; i++){
  //   set.add(arr[i]);
  // }
  // console.log(set);

  var set = new Set(arr);
  console.log(set);
  
</script>
</html>